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WO2022073924A1 - Enrouleur de ceinture conçu pour une ceinture de sécurité de véhicule - Google Patents

Enrouleur de ceinture conçu pour une ceinture de sécurité de véhicule Download PDF

Info

Publication number
WO2022073924A1
WO2022073924A1 PCT/EP2021/077284 EP2021077284W WO2022073924A1 WO 2022073924 A1 WO2022073924 A1 WO 2022073924A1 EP 2021077284 W EP2021077284 W EP 2021077284W WO 2022073924 A1 WO2022073924 A1 WO 2022073924A1
Authority
WO
WIPO (PCT)
Prior art keywords
actuator
freewheel
belt
cage
belt retractor
Prior art date
Application number
PCT/EP2021/077284
Other languages
German (de)
English (en)
Inventor
Marco Braun
Original Assignee
Zf Automotive Germany Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zf Automotive Germany Gmbh filed Critical Zf Automotive Germany Gmbh
Priority to CN202180068006.0A priority Critical patent/CN116323338A/zh
Priority to US18/247,756 priority patent/US20230373433A1/en
Publication of WO2022073924A1 publication Critical patent/WO2022073924A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/34—Belt retractors, e.g. reels
    • B60R22/44—Belt retractors, e.g. reels with means for reducing belt tension during use under normal conditions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/34—Belt retractors, e.g. reels
    • B60R22/46—Reels with means to tension the belt in an emergency by forced winding up
    • B60R22/4676—Reels with means to tension the belt in an emergency by forced winding up comprising energy-absorbing means operating between belt reel and retractor frame
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/34—Belt retractors, e.g. reels
    • B60R22/46—Reels with means to tension the belt in an emergency by forced winding up
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/34—Belt retractors, e.g. reels
    • B60R22/44—Belt retractors, e.g. reels with means for reducing belt tension during use under normal conditions
    • B60R2022/4493—Belt retractors, e.g. reels with means for reducing belt tension during use under normal conditions for braking the belt reel using friction surfaces or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/34—Belt retractors, e.g. reels
    • B60R22/46—Reels with means to tension the belt in an emergency by forced winding up
    • B60R2022/468—Reels with means to tension the belt in an emergency by forced winding up characterised by clutching means between actuator and belt reel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/34—Belt retractors, e.g. reels
    • B60R22/46—Reels with means to tension the belt in an emergency by forced winding up
    • B60R2022/469—Reels with means to tension the belt in an emergency by forced winding up reusable

Definitions

  • the invention relates to a belt retractor with a frame, a belt spool which is rotatably arranged in the frame and can accommodate a safety belt, at least one force limiter which enables the belt spool to rotate relative to the frame when a braking torque provided by the force limiter is overcome to release the seat belt, and a shiftable clutch, which has a shift cage and clutch elements, wherein the shift cage can be adjusted by means of an actuator from an open position, in which the clutch element is held out of engagement with the belt reel, to a closed position, in which the clutch elements attack the belt reel.
  • Such a belt retractor is known from DE 10 2017 11 1 398 A1.
  • the shift cage is rotatably mounted and has a radially protruding actuating pin.
  • a micro gas generator is provided, which is assigned a piston which in turn acts on the actuating pin.
  • the shifter cage When the shifter cage is in the closed position and the force limiter is accordingly coupled to the belt reel, the shifter cage is carried along when the belt reel rotates during a force limiting process. Accordingly, the actuating pin must also be able to rotate.
  • the actuating pin and the micro gas generator are arranged in such a way that the adjustment path of the piston of the Micro gas generator is a tangent to the movement path of the actuating pin and the actuating pin, when it performs a complete revolution, dips into a laterally arranged window of the micro gas generator.
  • the object of the invention is therefore to improve the belt retractor in such a way that an axially compact design results.
  • an actuator is provided according to the invention, which is arranged to be actuated with the actuator, and a freewheel, which couples the shift cage with the actuator so that the actuator can adjust the shift cage from the open position to the closed position.
  • the invention is based on the basic idea of achieving the free rotation of the shift cage required for the operation of the force limiter by means of a simple and axially flat freewheel.
  • the freewheel enables the torque required to close the clutch to be transmitted in one direction of rotation.
  • the shift cage is free to rotate in one direction relative to the actuator.
  • the actuator on the other hand, can remain stationary after activation of the clutch, eliminating the need to provide space to allow the actuator to rotate 360° as the belt spool rotates when the clutch is engaged.
  • the actuator provided according to the invention can be made longer in the radial direction than the known actuating pin. If the actuator is longer compared to the known actuating pin, ie it is located away from the belt reel, the actuator can overlap further axially with the clutch compared to the known prior art, resulting in an axially more compact design.
  • the construction according to the invention is therefore suitable for saving doubly axial space, namely on the one hand due to the axially flat freewheel and on the other hand due to the fact that the actuator axially overlaps with the freewheel.
  • a less powerful actuator can be used or, if one If the actuator continues to be used with the same power, faster actuation can be obtained because a higher torque can be achieved with a longer actuator.
  • the design is particularly flat axially.
  • the shifter cage can have at least one freewheel pawl, which interacts with freewheel teeth that are provided on the actuator.
  • the combination of the switchable clutch and the freewheel means that the freewheel only runs freely after the actuator has been triggered. Therefore, a simple freewheel construction can be chosen. If the at least one freewheel pawl and the freewheel toothing are formed in a complementary manner, surface tension in the contact area is reduced to a uniform level, so that ultimately a flat design of the freewheel is achieved.
  • the controller can have two, three or more transmission points, which are arranged regularly in the circumferential direction or at angular intervals of the same size.
  • the shift cage has a multiplicity of free-wheeling pawls which are arranged uniformly in the circumferential direction, an imbalance in the shift cage is avoided. This means that the shift cage can rotate smoothly even at high speeds and angular accelerations.
  • a shift cage that is easy to produce contains plastic or even consists of plastic and the freewheel pawls are preferably designed in one piece with the shift cage.
  • the freewheel teeth can be undercut.
  • the undercut can include, for example, that the tip of the tooth protrudes angularly in the direction of transmission of the freewheel over the corresponding tooth base or precedes it.
  • the undercut can have a cavity in the tooth flank, for example.
  • the actuator is an adjusting ring
  • its closed shape means it can guide and deliver the torque to be transmitted in a particularly stable manner. If the adjusting ring encloses the shift cage, the adjusting ring does not have to be mounted radially on the inside, so that installation space is saved, which means that an even flatter design is achieved.
  • the freewheel toothing can be internal toothing, which extends along an internal opening of the adjusting ring, so that many tooth-pawl contacts make it possible to transmit a high torque.
  • the maximum torque that can be transmitted is because all the freewheel pawls carry the load at the same time. As a result, the axial width of the freewheel can be reduced, resulting in a flat design.
  • the actuator can be mounted between a housing of the actuator and the shift cage.
  • the actuator is thus mounted radially so that it is positioned concentrically to the shift cage and secondarily to the belt reel.
  • the housing of the actuator can be designed and arranged to dissipate an actuator reaction force.
  • the housing of the actuator can be firmly connected to the frame, for example by means of a screw connection.
  • the actuator Since the actuator is supported by the actuator housing, an unwanted, radially migrating movement of the actuator can be prevented when the actuator is triggered: The actuator thus applies the torque evenly to the freewheel.
  • the housing of the actuator can also serve as the housing of the force limiter, for example to protect it from penetrating dirt.
  • the housing of the actuator has a shallow depression in which the actuator is arranged, no separate housing is required for the actuator, so that on the one hand fewer parts are used and assembled and on the other hand the Belt retractor axially flat builds.
  • the shallow depression can support the actuator axially or guide it during an infeed movement.
  • FIG. 2 shows the belt retractor from FIG. 1 in a front view
  • FIG. 3 shows the belt retractor from FIG. 1 in a side view
  • FIG. 4 shows the belt retractor from FIG. 1 in an exploded view, with a force limiter being shown in detail;
  • FIG. 5 and 6 show the belt retractor from FIG. 1 in mutually offset sectional views in a state in which a switching cage of the force limiter is in an open position
  • the belt retractor has a frame 10 .
  • a belt reel 12 is rotatably mounted in the frame 10 .
  • a seat belt 14 is partially wound onto the belt spool 12 .
  • Vehicle occupant of the vehicle in which the seat belt retractor is installed be buckled up so that he takes part in severe deceleration of the vehicle.
  • the belt retractor has several force limiters with which a braking torque can be generated against which the belt reel 12 can be rotated so that the seat belt 14 can be pulled off the belt retractor. This process can be used to limit the forces that act on the seat belt 14 and thus on the vehicle occupants when the vehicle is subjected to particularly high decelerations.
  • the force limiter relevant here has a wave washer 16, which can be coupled to the belt reel 12 for a force limiting process and, when it is carried along by it, provides the braking torque through a mixture of friction and deformation work.
  • the wave washer 16 is guided in a circumferential channel.
  • the channel is wave-shaped on the one hand by an axial end face of the frame 10 with projections attached thereto and on the other hand by a housing 18 flanged to the end face of the frame 10 with projections and/or recesses provided thereon.
  • the wave washer 16 is approximately ring-shaped and encloses a clutch cage 20.
  • the wave washer 16 is rigidly coupled to the clutch cage 20 in the circumferential direction.
  • the clutch cage 20 is generally ring-shaped and has recesses 58 radially on the inside, which narrow in one direction and in each of which a driver 60 and a retaining finger 62 of a shift cage 22 engages.
  • a coupling element 24 is accommodated in each case in the recess 58 between the driver 60 and the retaining finger 62 .
  • the coupling elements 24 are rollers here.
  • the clutch cage 20 is accommodated on a clamping surface 13 or a clamping attachment which is connected to the belt reel 12 in a rotationally test manner or is designed in one piece with it.
  • the clutch cage 20, the shift cage 22 and the Kupplungslemente 24 form a switchable clutch 26, by means of which the corrugated washer 16 can be coupled firmly in one direction of rotation with the clamping lug 13 of the belt reel 12.
  • the shift cage 22 is adjustable between an open position and a closed position by rotation Rk.
  • the coupling elements 24 do not engage in a load-transmitting manner on the clamping shoulder 13 of the belt reel 12, since they are held by the drivers 60 and the retaining fingers 62 of the shifter cage 22 in the wide section of the recesses 58. Therefore, the belt reel 12 is freely rotatable within the clutch cage 20 in the open position of the clutch 26 .
  • an actuator 28 is accommodated in the housing 18, which contains a micro gas generator 30 and a piston 32 in the exemplary embodiment shown.
  • the housing 18 forms a cylinder 34 in which the piston 32 can be moved.
  • the shift cage 22 is moved to the closed position by moving the piston 32, under the action of pressurized gas provided by the microgas generator 30 upon activation, from an initial position (see Figures 5 and 6) to an activation position in which it continues is spaced from the micro gas generator 30 (see Figures 11 and 12).
  • the movement of the piston 32 is transmitted to the shift cage 22 by means of an actuator 38 and a one-way clutch 40 or overrunning clutch, with which the shift cage 22 is driven in the direction towards the closed position of the clutch 26, but allows relative rotation in the opposite direction .
  • the actuator 38 is operatively connected via the freewheel 40 to a main section 36 of the shift cage 22 in such a way that an extension movement A of the piston 32 is translated into the adjusting rotation Rk of the shift cage 22 .
  • the actuator 38 has an inner section 42 that is closed in the form of a ring.
  • the actuator 38 is therefore designed as an adjusting ring or switching ring.
  • the actuator 38 also has a cam 44 that protrudes purely radially from the inner section 42 .
  • the actuator 38 is a flat plate.
  • the actuator 38 preferably has the same thickness as the main section 36 of the shift cage 22.
  • the belt tensioner is thus built in an axially compact manner.
  • the cam 44 is axially guided in a recess 46 of the housing 18 .
  • the recess 46 is formed in sections as a slit and in sections as open.
  • the actuator 38 is held in a starting position, which is shown in FIG.
  • a housing part 48 is flanged to the housing 18 .
  • the cam 44 is provided with a convex contact surface 50 whose curvature interacts with an end face 52 of the piston 32 during the extension movement A of the piston 32 or the corresponding rotation Rs of the actuator 38 . Since the end face 52 of the piston 32 rests against the contact surface 50, the actuator 38 is forcibly taken along when the piston 32 is displaced in the A direction. The end face 52 and the contact surface 50 thus form a contact coupling.
  • the actuator 28 is placed in the axial plane of the flat actuator 38, as a result of which the belt tensioner is axially compact.
  • the freewheel 40 is formed by at least one freewheel pawl 54 and one freewheel toothing 56 which are in operative engagement with one another.
  • the at least one freewheel pawl 54 is formed on an outer peripheral surface of the main portion 36 of the shift cage 22 .
  • the main section 36 is designed here as a flat plate which the clamping lug 13 of the belt reel 12 annular surrounds.
  • the drivers 60 and the retaining fingers 62 protrude from the main section 36 .
  • the main section 36 is arranged axially next to the clutch cage 20 in such a way that the drivers 60 of the shift cage 22 protrude into the recesses 58 of the clutch cage 20 .
  • the freewheel pawls 54 are designed in one piece with the shift cage 22 here.
  • the shift cage 22 can be designed together with the freewheel pawls 54 as an injection molded part.
  • a suitable plastic is selected as the material, which results in the desired strength and the necessary elasticity of the freewheel pawls 54 .
  • the freewheel toothing 56 extends at an inner opening of the inner section 42 of the actuator 38.
  • the highest possible transferable torque is achieved by having a large number of freewheel pawls 54 on the shift cage 22 and an identical number of teeth of the freewheel toothing 56 on the inner section 42.
  • the freewheel pawls 54 and the teeth of the freewheel teeth 56 are each arranged uniformly in the circumferential direction.
  • the outer peripheral surface of the main section 36 can be a purely constructive size.
  • the freewheel toothing 56 is undercut in the transmission direction, resulting in a one-sided detent, as a result of which the freewheel pawls 54 are caught. This increases the transmittable torque in a self-reinforcing manner.
  • the angle at which the freewheel pawls 54 protrude from the circumferential surface of the main section 36 of the shift cage, the length of the freewheel pawls 54 and - to put it simply - the diameter of the outer circumferential surface of the main section 36 and the freewheel teeth 56 are matched to one another in such a way that the individual freewheel pawls 54 in Transmission direction unloaded protrude approximately tangentially from the outer peripheral surface of the main portion 36. This increases the thrust force that can be transmitted per freewheel pawl 54 and thus the torque that can be transmitted.
  • FIGS. 5, 7, 9, 11, 13 and 15 lie in a plane which shows the interaction of the actuator 28, the positioner 38 and the freewheel 40.
  • the sectional views of Figures 6, 8, 10, 12, 14 and 16 are in contrast behind the main portion 36 of the shift cage 22 in a Level in which the clutch with the clutch cage 20, the shift cage 22 and the clutch elements 24 is shown.
  • FIGS. 5 to 10 show how the actuator 28 uses the actuator 38 to move the switching cage 22 into the closed position.
  • the initial state is shown in FIGS.
  • the belt reel is free to rotate relative to the clutch cage 20 and wave washer 16 because the clutch 26 is open.
  • the piston 32 has taken the actuator 38 and thus the shift cage 22 with it via the freewheel 40 in such a way that the coupling elements 24 are located between the sloping outer wall of the recess 58 and the cylindrical outer surface of the clamping attachment 13.
  • the clutch 26 is therefore closed, and a clockwise rotation of the belt reel 12 is transmitted via the clutch elements 24 to the clutch cage 20 and thus to the wave washer 16 .
  • the angle required to bring the shift cage 22 into the position in which the clutch 26 is closed during rotation Rk is preferably less than or equal to the angle through which the actuator 38 rotates during rotation Rs rotates as the piston 32 extends from the ready position to the activated position.
  • the belt retractor can be seen in a force-limiting state, in which the belt reel 12 is rotated clockwise under the effect of a high tensile force in the seat belt 14 .
  • the clutch cage 20 is carried along, as a result of which the shift cage 22 is also carried along. It can be seen that the tips of the freewheel pawls have moved somewhat away from the contact surface opposite them.
  • the freewheel pawls 54 are resiliently deflected radially inward as they slide on the teeth.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automotive Seat Belt Assembly (AREA)

Abstract

L'invention concerne un enrouleur de ceinture qui comprend : un cadre (10), une bobine de ceinture (12) montée rotative dans le cadre (10) et qui peut recevoir une ceinture de sécurité (14) ; au moins un limiteur de force (16) qui permet à la bobine de ceinture (12) de tourner par rapport au cadre (10) lorsqu'un couple de freinage appliqué par le limiteur de force (16) est dépassé, afin de libérer la ceinture de sécurité (14), et un accouplement débrayable (26), qui comprend une cage de débrayage (22) et des éléments d'accouplement (24), la cage de débrayage (22) pouvant être déplacée au moyen d'un actionneur (28) depuis une position ouverte, dans laquelle les éléments d'accouplement (24) sont maintenus dégagés de la bobine de ceinture (12), vers une position fermée, dans laquelle les éléments d'accouplement (24) agissent sur la bobine de ceinture (12). Afin d'obtenir une conception axialement compacte, l'enrouleur de ceinture comprend un élément de commande (38) qui est couplé à l'actionneur (28) et une roue libre (40) qui couple la cage de débrayage (22) à l'élément de commande (38) de façon que ledit élément de commande (38) puisse faire passer la cage de débrayage (22) de la position ouverte à la position fermée.
PCT/EP2021/077284 2020-10-07 2021-10-04 Enrouleur de ceinture conçu pour une ceinture de sécurité de véhicule WO2022073924A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202180068006.0A CN116323338A (zh) 2020-10-07 2021-10-04 用于车辆安全带的安全带卷收器
US18/247,756 US20230373433A1 (en) 2020-10-07 2021-10-04 Seatbelt retractor for a vehicle safety belt

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020126197.7A DE102020126197A1 (de) 2020-10-07 2020-10-07 Gurtaufroller für einen Fahrzeug-Sicherheitsgurt
DE102020126197.7 2020-10-07

Publications (1)

Publication Number Publication Date
WO2022073924A1 true WO2022073924A1 (fr) 2022-04-14

Family

ID=78078270

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2021/077284 WO2022073924A1 (fr) 2020-10-07 2021-10-04 Enrouleur de ceinture conçu pour une ceinture de sécurité de véhicule

Country Status (4)

Country Link
US (1) US20230373433A1 (fr)
CN (1) CN116323338A (fr)
DE (1) DE102020126197A1 (fr)
WO (1) WO2022073924A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12263807B2 (en) * 2022-12-08 2025-04-01 Jean Alain van Poppel Adaptive load-limiting seatbelt assembly
DE102023103162A1 (de) * 2023-02-09 2024-08-14 Autoliv Development Ab Gurtaufroller mit Kraftbegrenzungseinrichtung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006000661A1 (de) * 2006-01-03 2007-07-05 Trw Automotive Gmbh Gurtaufroller
DE102008011790A1 (de) * 2008-02-29 2009-09-03 Trw Automotive Gmbh Gurtaufroller für ein Sicherheitsgurtsystem
DE102017111398A1 (de) 2017-05-24 2018-11-29 Trw Automotive Gmbh Gurtaufroller und Verfahren zur Steuerung eines Gurtaufrollers

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009013923A1 (de) 2009-03-20 2010-09-23 Adomeit Group Gmbh Gurtaufrollsystem mit Einsteuerglied

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006000661A1 (de) * 2006-01-03 2007-07-05 Trw Automotive Gmbh Gurtaufroller
DE102008011790A1 (de) * 2008-02-29 2009-09-03 Trw Automotive Gmbh Gurtaufroller für ein Sicherheitsgurtsystem
DE102017111398A1 (de) 2017-05-24 2018-11-29 Trw Automotive Gmbh Gurtaufroller und Verfahren zur Steuerung eines Gurtaufrollers

Also Published As

Publication number Publication date
US20230373433A1 (en) 2023-11-23
DE102020126197A1 (de) 2022-04-07
CN116323338A (zh) 2023-06-23

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